Illuminating device



. @htenteci Mar. 12, 1935 STATES PATENT QFFICE ILLUMINATING DEVICECornelis Bol, Einclboven, Netherlands: assignor to General ElectricCompany, a corporation of The present New York Application September 8,1933, Serial No. 688,663

In Germany September 27, 1932 1 Claim.

invention relates to illuminating devices generally and moreparticularly the invention relates to such devices in which a gaseouselectric discharge lamp requiring-a trans- 5 former is the light source.v

The object of the invention is to provide a compact, easilyassembledlamp unit comprising.

a gaseous electric discharge lamp device and a transformer for saiddevice and a lamp unit of such construction that the parts thereof areseparately and easily removable therefrom. A

further object of the invention is to provide such av lamp unit which iseasily incorporated in reflectors n ow used. for incandescent lamps.

Still further objects and advantages attaching --to the'device and toits use and operation will be apparent to followin parti In accordancewith these objects the new and novel lamp unit comprises a supportforthe gaseous electric discharge lamp device and for the transformer ofaccommodates I eous atmosphe izable material those skilled in the artfrom the cular description.

-said lamp. Said support likewise a heat conservator for said lamp saryfor some types of discharge particularly those having a gasre comprisinga difficulty-vapor:-

, such as sodium. The lamp and the'heat conservator therefor areseparately and easily removed from said support. The support and thetransformer are enclosed by a housing which is removable from thelampunit without disturbing the lamp'device or the heat. conservator andthe lamp device and the heat conservator project from the housing. Saidhousing is provided with ventilating means andv baflles so that theelements, or parts of the elements, of

the lamp unit enclosed therein do not attain a harmful temperatureduring the operation of the lamp device.

The invention will be readily understood by an inspection of the drawingaccompanying and forming part of this specification and a perusal of thefollowing detailed description thereof.

Fig. 1 of the drawing is a front 'elevational,

partly sectiona unit,

of Fig. 1, and

Fig. 3 a side 1 view of the new and novel lamp the line 2-2 elevationalview of the new and novel lamp unit mounted on a support and-in areflector said reflector being shown in section.

Like numbers denote like partsin all the figures.

Referring to Figs. 1 and 2 the new and novel .consists of heatinsulating material, such as lamp unit comprises a transformer 1'1mounted on two support-strips T2. Said support-strips 2 are attached tothe part 1 which is the top of the housing and which has an opening 19therein to accommodate the current cable 20 which 5 is connected to thetransformer 1'7 and to accommodate support means for the lamp unit.

A plate 3 of insulation material,-such as hardrubber' or asbestos;provided with plug-contacts 4, is attached to said support strips 2.Said 10 plug-contacts 4 areelectrically connected to the transformer 1'7by suitable current leads. The contacts 4 accommodate the prongs of thebase 8 of the gaseous electric discharge lamp device 9. Said lamp 9comprises a cathode which is electron emitting when heated and twoanodes (not shown for purposes of simplicity) and has a gaseousatmosphere therein'comprising a rare gas and a metal vapor, such as neonand sodium vapor, and is similar in structure to the lamp devicedisclosed in my German Application Number 34, 20, filed in GermanySeptember 26, 1932 which corresponds to my United States Patent Number1,951,124, March 13,1934. It is desirable in this type of lamp devicethat the radiation of heat from the container of said lamp device bereduced to a minimum to maintain an effective vapor pressure thereinduring the operation thereof and a heat conservator is provided for thispurpose. The heat conservatorillustrated in the drawing is adouble-walled jacket 6 and the space between the walls of said jacket isevacuated, whendesired, but it will be understood of course, that Icontemplate the use of other types of heat conservators in thelamp'unit. Said jacket '6 is y provided with a bayonet base 21 whichslips over and is supported by-the plate 5.- Said plate 5 hard-rubber orasbestos, and is supported by rods 7 attached to said supports 2. Theheat insulating plate 5 reduces the transfer of heat from the lamp 9 tothe transformer 1'7 to a minimum and the plate '3 serves as a battle forthis purpose. The base 8 passes through and extends beyond the plate 5and the space between said lamp .9 and the conservator 6 is closed by ar n 10 comprising a circular, coiled metal spring embedded in heatinsulation material, such as asbestos. Said ring 10 also serves toprotect the 50 transformer 17 from the heat of said lamp 9. The stembfthe container of the lamp 9 is located in the elongated base 8 and outof the space enclosed by said ring 10 and said jacket 6 so that saidstem part is cooler than the other 55 parts of the container, of thelamp 9 which avoids cracking at said stem part. When desired the base 8is provided with ventilating means, such as openings 20, for thispurpose all as disclosed in my patent referred to heretofore.

The housing 11 for-said transformer 17 is attached to said cover 1 bymeans of screws 12 and is easily removable therefrom. An annular slot ispresent between the overlapping parts of said housing 11 and said cover1 for ventilating the interior of said housing 11'. The lower end ofsaid housing 11 is skirted and is partly closed by a cap 13. triangularrods 14 inserted in a clamp comprising the part 16 and the set screw 15as shown in Fig. 2 of the drawing. Said cap 13 is separated from theouter wall of the jacket 6 to avoid the direct transference of heat fromsaid jacket. 6 to said cap 13 and to provide ventilation for the partsenclosed in said housing 11. When the cap 13 is made of heat insulatingmaterial, such as hard rubber, this separation may be present, or not,as desired.

The above described lamp unit is compact, easily assembled and the'parts'thereof, such as the jacket 6, the lamp 9, the cap 13 and thehousing 11 are separately and easily inserted into and. removed fromsaid lamp unit which is of great advantage in inspecting, cleaning orrepairing the transformer 1'7, the lamp 9 and the jacket 6, particularlywhere the lamp unit is located in difficulty accessible places, such ashigh poles. The housing 11 is removable from the lamp unit withoutremoving the lamp'9 or Said cap 13 is supported by the jacket 6. Thetransformer 17, which furnishes the heating currentfor the thermioniccathode of said lamp 9,01 the operating current for said lamp 9 or both,as desired, is protected from the weather and dirt by said housing 11.The lamp unit is easily mounted on a support rod 25 and in a parabolicreflector 18 (Fig. 3) which is advantageous in street lighting, beaconwork or the like. The lamp unit is mounted on support 25 by insertingholding means in the opening 19.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:-

A lamp unit comprising in combination, a gaseous electric discharge lampdevice having a stem located in a perforated base, a heat conservatortherefor, a resilient ring of heat insulinsulating ring, the housingpart of said housingsupport', said lamp and-said heat conservator beingseparately removable from. said lamp unit, said base being located insaid ventilated housing-support and said ring being adjacent the jointbetween said base and said device.

Q CORNELIS BOL.

